This document introduces the versions supported by Cloud Service for etcd of Tencent Cloud and etcd of the community edition. This can help you choose the version that can best meet your business needs when using Cloud Service for etcd.
Version Definition
Major version: etcd versions are in the format of x.y.z. x indicates the major version, y indicates the minor version, and z indicates the patch version. They follow the requirements of Semantic Versioning. For example, the current versions are 3.5.4 and 3.4.13. Minor version: The tke.x suffix indicates the minor version corresponding to the current major version. For example, the current version is v3.4.13-tke.5.
Note:
If a version has no suffix, it is an open-source version in the community.
Version Maintenance Strategy
Cluster Creation
The platform supports creating clusters of the latest 2 major versions of etcd, such as 3.5.4 and 3.4.13. When a new version is released and it supports upgrades, the earlier version no longer supports cluster creation. For example, if the version 3.6.x is released and it supports upgrade from 3.5.4 to 3.6.x, 3.4.13 will no longer support cluster creation. If version 3.6.x is released but does not support upgrades, 3.4.13 still supports cluster creation.
Note:
Only the latest minor versions of the current major versions can be selected for cluster creation.
Upgrade and Ops Guarantee
The platform focuses on guaranteeing the normal upgrade and stable operation of the latest two major versions of etcd. For example, if the current latest version is 3.5.4, the platform focuses on guaranteeing the upgrade feature of versions 3.5.4 and 3.4.13, meanwhile supports troubleshooting, fault recovery, and bug fixing. Clusters of outdated versions may face the risks of unstable operation and upgrade failures. Please upgrade the version in time.
Note:
Cluster upgrades include major version upgrades and minor version upgrades.
Ticket Submission
Cloud Service for etcd provides technical support for the latest 2 major versions of etcd, including Q&A, online guidance, troubleshooting, and problem solving. However, for clusters with outdated versions, Cloud Service for etcd does not guarantee the quality and effectiveness of provided technical support.
Suggestions on etcd Major Version Selection
This document provides version selection suggestions from the perspectives such as stability, performance, and usability.
Stability: 3.4 series versions have undergone large-scale usage and verification by global users for 2-3 years, and the overall stability is better than that of 3.5 series versions. The 3.5.4 and later versions fixed the critical bugs in earlier 3.5 versions. The open-source project Kubernetes has also used 3.5.4 in its version 1.25, and the stability in core scenarios has met the production environment requirements.
Performance: Version 3.5.4 has merged a series of performance optimization PRs, significantly reduced the cluster startup time, and improved read/write QPS.
Usability: 3.5 series versions have solved the dependency management problems in 3.4 series versions and earlier versions through package modularization, which reduces burden for the developers. The use of 3.5 series versions is good for subsequent version upgrades.
In summary, version 3.5.4 is recommended for creating clusters. For migrating existing clusters, you can choose the version same as the source clusters.